639540711 has 16 divisors (see below), whose sum is σ = 950526720. Its totient is φ = 424983960.

The previous prime is 639540701. The next prime is 639540751. The reversal of 639540711 is 117045936.

639540711 is a `hidden beast` number, since 639 + 5 + 4 + 0 + 7 + 11 = 666.

It is not a de Polignac number, because 639540711 - 2¹⁰ = 639539687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639540701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29685 + ... + 46478.

It is an arithmetic number, because the mean of its divisors is an integer number (59407920).

Almost surely, 2^639540711 is an apocalyptic number.

639540711 is a deficient number, since it is larger than the sum of its proper divisors (310986009).

639540711 is a wasteful number, since it uses less digits than its factorization.

639540711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76483 (or 76477 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 639540711 is about 25289.1421562694. The cubic root of 639540711 is about 861.5676791478.

The spelling of 639540711 in words is "six hundred thirty-nine million, five hundred forty thousand, seven hundred eleven".